Spanish Fork Canyon is located in central Utah and is part of the Wasatch Mountain range. Since the coming of the white man to this section of country it has been used as a trail. The canyon provides summer range for stock as well as a watershed. Plant densities were determined by the point observation method using series of one-hundred square foot plots. Three areas which have been subject to different grazing uses were studied. The association changes in the canyon are the replacement of sage by slender wheatgrass on the shallow soils and the disclimax condition resulting from over-grazing and fire with the annuals Bromus tectorum and Salsola pestifer replacing the true climax. The sage of protected alluvial fans shows rapid growth recovery and reproduction.

Successful replication of the genome during each cell cycle requires that every replication fork merge with its opposing fork. However, lesions in the template DNA or protein-DNA barriers often impede replication forks and threaten the timely completion of genome duplication. If a fork encounters a replication fork barrier (RFB), it can be subject to a variety of fates. In some cases the replisome is maintained in a manner such that it can resume DNA synthesis when the barrier is removed. Alternatively the stalled fork is simply held in a competent state to merge with the opposing fork when it arrives. However, fork stalling can also precipitate dissociation of the replisome (fork collapse) or even fork breakage. If this happens the recombination machinery can intervene to restore DNA integrity and restart replication, albeit with a risk of causing deleterious genetic change if ectopic homologous sequences are recombined. I have exploited a site-specific RFB in fission yeast termed RTS1 to investigate the consequences of perturbing a single replication fork. RTS1 is a polar RFB (i.e. it blocks fork progression in a unidirectional fashion), enabling replication to be completed by the opposing fork. Despite this, fork blockage at RTS1 triggers a strong recombinational response that is able to restart DNA synthesis, which at least initially is highly error prone. Here, I present my work in establishing a live cell imaging approach to visualizing the recombinational response at the RTS1 RFB, demonstrating that the majority of cells initiate recombination-dependent replication (RDR). RDR begins within a few minutes of fork blockage and is only curtailed by the arrival of the opposing fork. It depends on the Rad52 protein, which remains associated with the restarted fork and whose presence correlates with its infidelity. I also illustrate the significance of various genetic factors, including Rad51, the Rad51 mediators, Fml1 helicase, Rad54 translocase, Pfh1 sweepase, and Cds1 checkpoint kinase, in modulating Rad52 localization and block-induced recombination at the RTS1 RFB.

No description available.

An examination of previously unaccessioned and overlooked specimens has added 16 species to the vascular flora of the 3800 ha Rocky Fork Tract in northeastern Tennessee. One species was deleted because of a prior misidentification for a net gain of 15 species and a total of 764 species. One species, Solidago lancifolia (Torr. ex A. Gray) Chapm., is listed as Endangered in Tennessee. All additions except two, represent county records. ©2018 Botanical Research Institute of Texas.

Consider a feedforward network of single-server stations populated by multiple job types. Each job requires the completion of a number of tasks whose order of execution is determined by a set of deterministic precedence constraints. The precedence requirements allow some tasks to be done in parallel (in which case tasks would "fork") and require that others be processed sequentially (where tasks may "join"). Jobs of a. given type share the same precedence constraints, interarrival time distributions, and service time distributions, but these characteristics may vary across different job types. We show that the heavy traffic limit of certain processes associated with heterogeneous fork-join networks can be expressed as a semimartingale reflected Brownian motion with polyhedral state space. The polyhedral region typically has many more faces than its dimension, and the description of the state space becomes quite complicated in this setting. One can interpret the proliferation of additional faces in heterogeneous fork-join networks as (i) articulations of the fork and join constraints, and (ii) results of the disordering effects that occur when jobs fork and join in their sojourns through the network.

No description available.

Thesis (D. Min.)--Midwestern Baptist Theological Seminary, 2000. / Includes bibliographical references (leaves 159-165).

Large carnivores have been subjected to overexploitation and extensive habitat loss for centuries. Reintroduction has become an increasingly used tool for recovering and reestablishing large carnivore populations; however, most reintroductions have either failed or resulted in small populations that are vulnerable to deleterious demographic, environmental, and genetic effects that can lead to population loss or extinction. Longterm monitoring of small, reintroduced populations is critical to population persistence and viability. To evaluate long-term reintroduction success and current status of a recently reintroduced, small black bear (Ursus americanus) population in the Big South Fork area of Kentucky, I used non-invasive hair sampling in a systematic, closedpopulation capture-mark-recapture study design. I used ≥ 20 microsatellite loci to identify individual bear, quantify genetic diversity, investigate genetic relatedness, estimate population abundance and density, and investigate patterns of range expansion. The Big South Fork population is comprised of closely-related individuals, is small (N = 40; 95% CI: 30-113), of low density (0.03 bear/km2), has experienced minimal range expansion, and exhibits decreased genetic diversity (HE = 0.698). Because of prolonged isolation from nearby subpopulations, the Big South Fork population remains vulnerable and requires immediate and continued monitoring.

Thesis (M.S.)--University of Montana. / Typescript. Includes bibliographical references (leaves 72-74).

Thesis (Ph. D.)--Oregon State University, 1986. / Typescript (photocopy). Includes bibliographical references (leaves 159-167). Also available online.